AW Gear Meters DH-Dual User Manual

DH Dual Hall Effect Pickup

Installation and Technical Data Guide

AW Gear Meters Franksville, WI Phone: [phone] Fax: [phone]

Email: [e-mail] www.awgearmeters.com

Rev 06/10

Description:

The DH Dual Hall Effect Pickups are microprocessor-based sensors for use with the JV-CG and JV-KG series
of positive displacement flow meters. The DH sensors can detect both uni- and bi-directional flow. The sensors’
mode of operation is determined by an output selection switch located inside the housing. The DH detects the
rotation of the flow meter’s gears and emits a frequency signal proportional to flow. The output signal is a
square wave pulse which has a duty cycle of approximately 50%.

DH signal outputs are protected with a self-resetting fuse. This fuse has a 50mA nominal trip point. When a trip
occurs, turn off power to the sensor and remove output load to reset fuse. The sensor has two different output
configurations: sinking output and sourcing output.

The DH sensor circuit board is equipped with a red and green LED. The red LED is a status LED which, when
the sensor is operating properly, will flash once every 2 seconds. The green LED indicates the pulse of the
input signal. Note that signals above 20Hz will look as solid green.

Installation:

• Ensure that the flowmeter sensor cavity is free of debris prior to installing pickup

• Make sure the sensor mounting screws line up with the sensor mounting holes. If they do not, remove and
rotate the sensor 180°

• Sensor is equipped with an output test feature for readouts before initial running of your system

TEST FEATURE:

Note: Power must be cycled for new setting to take effect

• Switch setting 8 will cause the pick-up to output a 10 Hz (+/- 20%) Phase = +90 deg pulse output, simulating

low flow conditions without flow through your meter.

• Switch setting 9 will cause the pick-up to output a 250 Hz (+/- 20%) Phase = -90 deg pulse output, simulat-

ing medium flow conditions without flow through your meter.

NOTE: WIRING SHOULD BE INSTALLED BY A QUALIFIED INSTRUMENTATION TECHNICIAN

Pin Number Wire Color
Signal 2: 2 Green
Signal 1: 4 White
Ground: 5 Black

Supply Voltage: 6 Red

Wiring Color Code

Pin Number DH-A / -AA DH-B / -BB

1 NC NC
2 Output 2 Output 2
3 NC NC
4 Output 1 Output 1
5 Ground Ground

6 Supply Supply

Electrical Connection for Pin Connector

1 3 5

6

Pinout looking at male

connector on sensor

Switch Output 1 Output 2

0 Direction Signal 2
1 Signal 1 Signal 2
2 Direction Signal 1 + 2 (2x frequency)
3 Signal 1 Signal 1 + 2 (2x frequency)
4 Signal 1 (both outputs in phase)
5 Signal 2 (both outputs in phase)
6 Signal 1 + 2 (both 2x frequency & both outputs in phase)
7 Reserved
8 Test: S1 & S2 == 10 Hz (+/- 20%) Phase = +90 deg.
9 Test: S1 & S2 == 250 Hz (+/- 20%) Phase = -90 deg.

DH Operating Modes

Top view of circuit board with

view of LED’s and switch

Note: Power must be cycled for new

setting to take effect

DH Dual Hall Effect Pickup

Installation and Technical Data Guide

AW Gear Meters Franksville, WI Phone: [phone] Fax: [phone]

Email: [e-mail] www.awgearmeters.com

Rev 06/10

DH-A

/ -AA Sinking Output Circuit

~40 Ohm

SUPPLY

OUTPUT

GROUND

Analog
Switch

DH-B / -BB Sourcing Output Circuit

~40 Ohm

SUPPLY

OUTPUT

GROUND

Analog
Switch

• User may need to add external components to interface to displays
or other instruments

• User must limit output voltage to Supply -1V

• Max current sinking capability: 50mA

• Signal output square wave :
V

high

= Supply -1V @ no output load

V

low

= 0.1V

• Max sourced output voltage: Supply -0.5V

• Max current sourcing capabilities: 50mA

Supply Voltage: +10 to 27 Volt DC
Supply Current: 18 mA @ 12 VDC, 25 mA @ 24 VDC
Duty Signal: 50% ± 15%
Minimum Signal: 0.5 Hz
Frequency Output: Flow dependent, up to 2,000 Hz
Driving Capacity: 50 mAMax resistive load
Output Impedance: ~ 40 Ohm - analog switch and self-resetting fuse
Temperature Range: -40° F to 185° F (-40° C to 85° C)

Technical Data:

1.19"

DH-X: (2.12")

DH-XX: (2.39")

Part number configuration:

DH Sensors can be used with all Aluminum, 303
Stainless Steel and 316 Stainless Steel body flow meters

JV-CG 01, 10, 15, 20 & 30
JV-KG 12, 20 & 30

JV-60CG & JV-60KG ONLY

DH-A, DH-B

DH-AA, DH-BB